var multer = require('multer');

Date.prototype.Format = function (fmt) { //author: meizz
    let o = {
        "M+": this.getMonth() + 1, //月份
        "d+": this.getDate(), //日
        "h+": this.getHours(), //小时
        "m+": this.getMinutes(), //分
        "s+": this.getSeconds(), //秒
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度
        "S": this.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var k in o)
        if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    return fmt;
};

let storage = multer.diskStorage({
    //设置上传后文件路径，uploads文件夹会自动创建。
    destination: function (req, file, cb) {
        cb(null, './public/trainExam/uploads')
    },
    //给上传文件重命名，获取添加后缀名
    filename: function (req, file, cb) {
        let fileFormat = (file.originalname).split(".");
        cb(null, new Date().Format("yyyyMMddhhmmssS") + "." + fileFormat[fileFormat.length - 1]);
    }
});

//添加配置文件到muler对象。
let upload = multer({
    storage: storage
});

//导出对象
module.exports = upload;